Could you please help me to know where I can get Main.xaml file.
Sure, it is in your process folder location GmailOpening (C:\Users\jyotirmayee.sahoo\Documents\UiPath\GmailOpening). You can attach the entire folder 
Yes
We managed to reproduce the issue on our side.
Please try to perform the following steps as a workaround for the issue:
- Open Task Manager and kill all processes related to UiPath Studio (Only the processes):
- Relaunch Studio and try to run again the Flowchart that was failing.
If this does not help, try a restart of the computer and then try to run the process again.
Please let us know what happens after you try the 2 options provided above. Thank you!
Tried both the options
1st option : After killing when I am opening studio again its enabling all the buttons but again if something failing then the issue persists the same. So it’s not possible to end task each time and relaunch the application.
2nd option : tried restart also but same thing happened.
Alright. Can you please perform the following steps:
- Open a Command Prompt window - click on the Windows Start button, then search for “CMD”, and hit ENTER.
- Navigate in the Command Prompt window to the folder of the Studio Installation. Use the following command:
cd C:\Users\%username%\AppData\Local\UiPath\app-19.6.0 - Then run the following command in the Command Prompt window:
UiPath.DiagTool.exe --file diagTool.zip
This will create a diagTool.zip file on your Desktop. Can you please attach it here after you manage to generate it? Thank you!